Ezra w



(No Model.)

' E. W. JACKSON.

AUTOMATIC SAFETY GATE.

Patented Nov. 17, 1891.

m2 mam: PETERS co mmzrumm, vusmnm'ou, a v4 showing the sheaves at the top, also a sec= epicycloidal wheel and its connection with UNITED STATES PATENT OFFICE.

EZRA W. J AOKSON, OF CHICAGO, ILLINOIS, ASSIGNOR OF SEVEN-TVENTIETHS TO MARY LOUISA MILLS AND HENRY JACKSON, OF SAME PLACE.

AUTOMATIC SAFETY-GATE.

SPECIFICATION forming part of Letters Patent No. 463,194, dated November 1'7, 1891.

Application filed March 2, 1891. Serial Il'o. 383,529. (No model.)

To all whom it may concern:

Be it known that I, EZRA W. JACKSON, a citizen of the United States, residingat Chicago, in the county of Cook and-State of Illinois, pray that Letters Patent be granted to me for Improvements in Automatic Safety- Gates, as set forth in the annexed specification.

My invention relates to improvements in the method of raising and lowering vertical safety-gates for draw-bridges or road-crossings and may be operated automatically or otherwise.

The objects of myimprovements are as follows: first, to provide automatic motion by placing at either end of the draw-bridge se mental cog-gearing which is'connected with pinion-gearing to operate an air-pump which forces the air to a vertical cylinder through pipes having automatic rotary valves, thus producing vertical motion; second, to convert the vertical motion of the piston into a rotary motion by employing an epicycloidal wheel; third, to provide accelerated motion equal to the distance the gate will rise by connecting the epicycloidal wheel with a sheave; fourth, to provide a vertical motion of the gate (the power being derived from one side only) by the applicationjto itland to the sheave of a chain or wire rope in such manner as to raise or lower the gate at each stroke of the piston-rod, and, fifth, to construct a gate that will not sag, although being fifty feet in length and suspended at each end. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical section of the entire gate, showing the floor and end timbers of the draw-bridge and the connections of the airpump and other machinery thereto. Fig. 2 is a top view of the segmental c0g-gearing on the end of the bridge and its connections with the pinion and the gear-wheel. Fig. 3 is a vertical and side view of the epicycloidal wheel and sheaves and their connection with the gate-post. Fig. 4C is a side view of the the sheave, indicated by dotted lines. Fig. 5 is a vertical section of apart of the gate post,

tion of the gate showing sections of the iron or steel angles. Fig. 6 is a view of a crosssection of the post and a longitudinal view of the gate, showing tension-rods and the connection of the gate with the post.

Similar letters and figures refer to similar parts throughout the several views.

The segmental cog-gearing A being secured to the timbers at either end of the draw-bridge, the motion of the draw-bridge turns pinion B and its attached gearing O O O. The shaft D is connected at one end with gearing O O O and at the other with cam E, and to the latter is secured the connecting-rod F, which is connected at its lower end with lever G, Fig. 1. Lever G is secured at fulcrum H and connected at the opposite end with the lever of the air-pump I. Thus the air-pump is operated, and compressed air is forced from the bottom of the pump or through pipe J and rotary valve K into the cylinder L at M and rotary valves K and h, and also to slide-valve i, by the chain it n. This combination closes rotary valve K, opens rotary valve 72, moves the slide-valve '6 from port 70 over port i and allows the air to escape from port it. The r0- tary valve h is now open for the admission of compressed air, which forces piston b upward and restores the rotary and the slide valves to their original positions.

Second. Thechain N,being connected at the lower end of the piston-rod e, passes around sheave O, thence around sheave P, which is secured to the epicycloidal wheel Q, (see Fig. 3,) and oversheave Rto piston-rod d at S. The connection of the two piston-rods cl and e by the chain Nto the fixed sheave P and the connection of the large sheave T with the epicycloidal wheel produce at each stroke of the piston-rods cl and c rotary motion equal to the vertical motion of the gate. The chain or wire ropeJ (see Fig. 1) passes from sheave T to sheave m, to sheave s, to sheave a, to lower end of weight 7), while the other end of said chain or wire rope is attached to the upper end of weight V and passes over sheave W to sheave X and X, to sheave Z, to sheave T, thus making a complete circuit. By the attachment of weight w by chain or wire rope to J, the attachment of the weights 4) and w to the gate g at 2 2, (the weights together being equal to the Weight of the gate,) and the connection of the gate g by the chain or wire rope to sheave T, as described, the vertical motion of the gate is assured. The gate q, (see side view, Fig. 1,) is divided into panels U U U U, made of wire-screen or spread metal, with margins on either side of iron or steel angles 7' r, riveted together. (See section, Fig. 5.) Fig. 6 shows the tension-rods -y y y, secured at either end of the gate and resting on the bearings at P P P, while the chain or Wire rope passing under the gate and under large pulley X acts as a tension-rodonaccount of its connection with the Weight V. The truss-rod 3, (see Fig. 1,) being secured at the top of each post and joined midway be tween them by a sleeve-nut, prevents the post 4 at from spreading.

I am aware that prior to my invention ver tical gates have been used, so I do not broadly claim such a combination; but

What Iv do claim as my invention, and desire to secure by Letters Patent, is-

1. In a bridge-gate, the combination, with an air-pump and a piston actuated thereby, of the segmental cog-gearing A, the pinion B, gearing C C O, the cam E, rod F, levers G and I, and valve-operating mechanism actuated by said piston, all substantially as set forth.

2. The combination of the air-pump ct, the cylinder L, the rotary valves K and h, the slide-valve 2', and connections for operating said valves, with the wheel Q, piston-rod (Z 6, and chain N, all substantially as and for the purpose set forth.

3. In a bridge-gate, the combination, with the sheave T and operating mechanism actuated by the segmental cog-gearing A, of the gate q, the endless chain or cable j, attached counterbalance-weights v and w, sheaves m, s, M, W, 00, cc, and 2, all operated by the said sheave T, substantially as and for the purpose set forth.

4. The combination, with agate q, provided with metallic panels 0 1) v Q}, having angle-iron margins r r, of the tension-rods y y y, fixed to the sides and bottom of said gate q, in the manner and for the purpose set forth.

. EZRA, W. J AOKSON. Witnesses: bro. 0. IVEY,

EMORY- J. MILLS. 

